JPH0525586B2 - - Google Patents
Info
- Publication number
- JPH0525586B2 JPH0525586B2 JP58051198A JP5119883A JPH0525586B2 JP H0525586 B2 JPH0525586 B2 JP H0525586B2 JP 58051198 A JP58051198 A JP 58051198A JP 5119883 A JP5119883 A JP 5119883A JP H0525586 B2 JPH0525586 B2 JP H0525586B2
- Authority
- JP
- Japan
- Prior art keywords
- arm
- fulcrum
- fixed
- stopper
- lever
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000002184 metal Substances 0.000 claims description 25
- 229910052751 metal Inorganic materials 0.000 claims description 25
- 230000007246 mechanism Effects 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 10
- 230000033001 locomotion Effects 0.000 claims description 9
- 238000009749 continuous casting Methods 0.000 claims description 8
- 230000004044 response Effects 0.000 claims description 5
- 230000002829 reductive effect Effects 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000006872 improvement Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241000245665 Taraxacum Species 0.000 description 1
- 235000005187 Taraxacum officinale ssp. officinale Nutrition 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
- B22D11/187—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by using X-rays or nuclear radiation
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- High Energy & Nuclear Physics (AREA)
- Toxicology (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Description
【発明の詳細な説明】
本発明は金属の溶湯、とくに溶鋼の連続鋳造に
おけるモールド湯面の自動制御装置の改良に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an automatic mold level control device in continuous casting of molten metal, particularly molten steel.
鋼の連続鋳造において、水冷銅モールド内の溶
湯レベルを一定に保つために、ダンデイツシユな
どの容器からの溶湯の供給速度を調節する試みが
種々なされている。 In continuous casting of steel, various attempts have been made to adjust the rate of supply of molten metal from a container such as a dungeon in order to maintain a constant level of molten metal in a water-cooled copper mold.
溶湯供給速度の調節は、とくに鋳片断面積が小
さいビレツトの鋳造においては、きわめて微細に
行なわなければならない。また、溶湯レベルの上
下に対して供給速度を変化させるときも、迅速に
応答できなければならない。 The molten metal supply rate must be adjusted very precisely, especially when casting billets with a small cross-sectional area of the slab. It must also be able to respond quickly when changing the feed rate to raise or lower the molten metal level.
ダンデイツシユからの溶湯流出の速度を調節す
るためにスライデイングノズルの開度を変えるこ
とは、ノズル部分におけるガスの巻き込みや湯も
れが起りやすいというスライデイングノズル固有
の問題に加えて、応答が十分速くない点で、有利
とはいえない。 Changing the opening degree of the sliding nozzle in order to adjust the speed of molten metal flowing out from the dungeon is not only a problem inherent to sliding nozzles, such as gas entrainment and leakage at the nozzle, but also problems with sufficient response. Since it is not fast, it cannot be said to be an advantage.
本発明者らの一部は、ダンデイツシユのストツ
パーの開度を調節することにより溶湯流出速度を
調節する方法を採用することとし、その微細な制
御を可能にする技術を確立して、すでに提案した
（特願昭57−188205号）。 Some of the inventors decided to adopt a method of adjusting the molten metal outflow speed by adjusting the opening degree of the stopper of the dumping tray, and established a technology that enables fine control. (Special Application No. 188205, 1982).
さきの発明の連続鋳造モールドの湯面自動制御
システムは、第１図において、点線で囲んだ本発
明による改良部分を別にすれば全体の構成が示さ
れるように、連続鋳造溶の水冷モールド５へ金属
溶湯１０を供給する開度可変ストツパー１をそな
えた溶湯容器（代表的にはダンデイツシユ）２、
モールド湯面検出装置（好適にはγ線源６１とそ
の透過線量測定器６２の組み合わせからなる検出
装置）６およびストツパー開度調節機構３から本
質的に構成されるシステムであつて、ストツパー
開度調節機構３が溶湯容器２に固定した固定レバ
ー３１、この固定レバー上に支点を有し動作点に
ストツパー１の上端をとりつけた可変レバー３
２、固定レバーに固定され可変レバーの力点にと
りつけられたネジつきサーボモーター３３、およ
び前記モールド湯面検出装置からの信号に応じて
サーボモータ３３を回転させて可変レバーの力点
を上下動させるモーター制御回路４からなり、力
点の動きをテコの原理で縮小して動作点に伝える
ことによりストツパーの開度の微細な調節を可能
にしたことを特徴とする。 The automatic mold level control system for a continuous casting mold according to the previous invention is applied to a water-cooled mold 5 for continuous casting, as shown in FIG. a molten metal container (typically a dandelion) 2 equipped with a variable opening stopper 1 for supplying molten metal 10;
A system essentially consisting of a mold level detection device (preferably a detection device consisting of a combination of a gamma ray source 61 and its transmission dose measuring device 62) 6 and a stopper opening adjustment mechanism 3, which controls the stopper opening. The adjustment mechanism 3 includes a fixed lever 31 fixed to the molten metal container 2, and a variable lever 3 having a fulcrum on the fixed lever and having the upper end of the stopper 1 attached to the operating point.
2. A screwed servo motor 33 fixed to the fixed lever and attached to the force point of the variable lever, and a motor that rotates the servo motor 33 in response to a signal from the mold level detection device to move the force point of the variable lever up and down. It consists of a control circuit 4, and is characterized by being able to finely adjust the opening degree of the stopper by reducing the movement of the force point using the lever principle and transmitting it to the operating point.
この発明によつて、モールド湯面が自動的に制
御され、湯面変動幅が従来よりずつと小さく抑え
ることができるようになつた。湯面およびスラグ
層の動きが安定かつ規則的になるに伴ない、浸
炭、ピンホール、いわゆるノロカミが著しく減少
または絶無となり、鋳片表面の品質が顕著に改善
されるようになつた。 According to this invention, the mold hot water level is automatically controlled, and the width of the hot water level fluctuation can be kept smaller than before. As the movement of the molten metal surface and slag layer became more stable and regular, carburization, pinholes, and so-called slags were significantly reduced or eliminated, and the quality of the slab surface was significantly improved.
ところが、このシステムを長期にわたつて実施
したところ、ストツパー先端の溶損が著しくな
り、当初よりストツパーを押し下げた状態で使用
するようになるにつれて、応答性が劣り制御の効
果が低下することが経験された。これは、第２図
に示すように、ストツパー１を押し下げる方向に
可変レバー３２が傾くと、ストツパーの先端１１
が横振れして、ノズルに対して偏心するためであ
る。その詳細は第３図にみるとおりであつて、ス
トツパー先端の上下動ｙに横方向の偏位ｘが伴
う。 However, after using this system for a long period of time, we found that the tip of the stopper became noticeably eroded, and as the stopper was used with the stopper pressed down from the beginning, the response became poorer and the effectiveness of the control decreased. It was done. As shown in FIG. 2, when the variable lever 32 is tilted in the direction of pushing down the stopper 1,
This is because the nozzle oscillates laterally and becomes eccentric with respect to the nozzle. The details are as shown in FIG. 3, and the vertical movement y of the stopper tip is accompanied by a lateral deviation x.
本発明はこの点を改善したものであつて、スト
ツパーを可変レバーに固定せず、両者の連結に四
辺形の連結手段を採用し、円運動をほぼ直線の運
動に変換する原理による。 The present invention is an improvement on this point, and is based on the principle that the stopper is not fixed to the variable lever, but a quadrilateral connecting means is used to connect the two, and circular motion is converted into approximately linear motion.
本発明の連続鋳造モールド湯面の自動制御装置
は、上記の連結手段を除く全体の構成は第１図に
示し、連結手段は第４図に示すように、モールド
へ金属溶湯を供給する可変ストツパーつき溶湯容
器、モールド湯面検出装置およびストツパー開度
調節機構から本質的に構成される自動制御装置で
あつて、ストツパー開度調節機構が、溶湯容器２
に固定された固定アーム（前記固定アームに相
当）、この固定上にテコの支点Ｂを有する作動ア
ーム３２、この作動アーム３２とストツパー１上
端とをテコの動作点Ｃにおいて結合する結合アー
ム３８、固定アーム３１に固定され作動アーム３
２のテコの力点Ａにとりつけられたネジつきサー
ボモーター３３、および前記モールド湯面検出装
置６からの信号に応じてサーボモーターを回転さ
せて作動アーム３２の力点４を上下動させるモー
ター制御回路４からなり、固定アーム３１のテコ
の支点Ｂを下部固定支点としてその上方に上部固
定支点Ｄを設け、テコの動作点Ｃすなわち作動ア
ームと結合アームとの結合点を下部移動支点Ｃと
し、その上方に上部移動支点Ｅを設け、上部固定
支点と上部移動支点とを拘束アーム３９で拘束し
て、上記４支店間で平行四辺形BCEDを形成し、
力点Ａの上下動をテコで縮小して動作点Ｃに伝
え、上記四辺形状の連結により、第５図に示すよ
うにストツパー１が横振れを実質上伴なわずに上
下に動きストツパー開度の微細な調節を可能にし
たことを特徴とする。 The automatic continuous casting mold level control device of the present invention has an overall configuration as shown in FIG. 1 except for the above-mentioned connecting means, and the connecting means is a variable stopper for supplying molten metal to the mold as shown in FIG. The automatic control device is essentially composed of a molten metal container, a mold level detection device, and a stopper opening adjustment mechanism, and the stopper opening adjustment mechanism is connected to the molten metal container 2.
a fixed arm (corresponding to the fixed arm) fixed to the fixed arm, an operating arm 32 having a lever fulcrum B on the fixed arm, a connecting arm 38 that connects the operating arm 32 and the upper end of the stopper 1 at the operating point C of the lever; The actuating arm 3 is fixed to the fixed arm 31.
A motor control circuit 4 rotates the servo motor in response to signals from a screwed servo motor 33 attached to the force point A of the lever No. 2 and the mold water level detection device 6 to move the force point 4 of the operating arm 32 up and down. The lever fulcrum B of the fixed arm 31 is the lower fixed fulcrum, the upper fixed fulcrum D is provided above it, the operating point C of the lever, that is, the connection point between the operating arm and the coupling arm is the lower moving fulcrum C, An upper moving fulcrum E is provided at , and the upper fixed fulcrum and the upper moving fulcrum are restrained by a restraining arm 39 to form a parallelogram BCED between the four branches,
The vertical movement of the force point A is reduced by a lever and transmitted to the operating point C, and by the connection of the four sides, the stopper 1 moves up and down with virtually no lateral vibration, as shown in Fig. 5, and the stopper opening degree is changed. It is characterized by allowing minute adjustments.
４支点間で形成する四辺形BCEDは、下部固定
支点−移動支店間つまりBCの距離より上部固定
支点−移動支点間つまりDEの距離をわずかに短
くした四辺形とすれば、作動アーム３２の回転に
つれストツパー１が押し下げられるとき、水平方
向にはＣ点がＢ点に少し引き寄せられる分を相殺
するように、ストツパー先端を遠くへ（図では左
側へ）押しやることができる。しかし、通常はほ
ぼ平行四辺形とすることで足りる。 If the quadrilateral BCED formed between the four fulcrums is a quadrilateral with the distance between the upper fixed fulcrum and the movable fulcrum, that is, DE, slightly shorter than the distance between the lower fixed fulcrum and the movable fulcrum, that is, BC, then the rotation of the actuating arm 32 As the stopper 1 is pushed down, the tip of the stopper can be pushed farther away (toward the left in the figure) so as to offset the slight pull of point C towards point B in the horizontal direction. However, it is usually sufficient to make it almost a parallelogram.
この自動制御装置の作動機構は、さきに開示し
た装置と同じである。すなわち、水冷モールドに
おける溶湯レベルが上下したとき、それを前記の
検出装置で検出したならば、モーター制御回路４
がネジつきサーボモーター３３を、あらかじめ定
めた角度だけ回転させる。ネジの前進後退によ
り、作動アームの力点Ａは上下し、その動きは支
点Ｂをへて動作点Ｃに伝えられ、ストツパー１を
上下させてそのタンデイツシユ底部のノズル２１
との開度を微細に変化させる。 The operating mechanism of this automatic control device is the same as the previously disclosed device. That is, when the molten metal level in the water-cooled mold increases or decreases, if this is detected by the detection device, the motor control circuit 4
rotates the threaded servo motor 33 by a predetermined angle. As the screw advances and retreats, the force point A of the operating arm moves up and down, and this movement is transmitted to the operating point C through the fulcrum B, which moves the stopper 1 up and down and releases the nozzle 21 at the bottom of the tundish.
Finely change the opening degree.
湯面検出装置およびモーター制御回路は、それ
ぞれの分野で既知の技術に従つて構成すればよ
い。 The hot water level detection device and the motor control circuit may be configured according to techniques known in their respective fields.
そのほかの諸点も、さきの装置と本質的に異な
るところはない。たとえば、好ましい態様におい
ては、固定アーム３１は、溶湯容器２の側壁２１
にとりつけた上下方向のガイド３４に沿つて一定
の範囲内で任意の位置に固定でき、鋳造開始時に
ストツパーに定常的な位置を与えるようにする。
これは、たとえばラツク−ピニオンの機構３５を
手動レバー３６で操作することによつて行ない、
個々の操業条件に応じて設定したストツパー開度
を実現する。固定アームが所定の位置を占めたな
らば、エアーチヤツク３７で拘束して、その位置
に固定する。 In other respects, there is no essential difference from the previous device. For example, in a preferred embodiment, the fixed arm 31 is attached to the side wall 21 of the molten metal container 2.
The stopper can be fixed at any position within a certain range along a vertical guide 34 attached to the stopper, and a steady position is given to the stopper at the start of casting.
This is done, for example, by operating a rack-and-pinion mechanism 35 with a manual lever 36;
Realizes the stopper opening degree set according to individual operating conditions. Once the fixed arm is in a predetermined position, it is restrained by an air chuck 37 and fixed in that position.
エアーチヤツクによる固定は、異常時たとえは
溶湯レベルがある限度を越えて上昇したような場
合に、電磁弁７が作動して拘束を解くようにする
とよい。エアーチヤツクが開放されると、固定ア
ーム３１は前記ガイド３４に沿つて最下位の位置
まで下降し、ストツパー１がタンデイツシユ底部
のノズル２１に密着して溶湯の供給が止まる。 It is preferable that the fixing by the air chuck is such that the electromagnetic valve 7 is operated to release the restraint in case of an abnormality, for example, when the molten metal level rises beyond a certain limit. When the air chuck is opened, the fixed arm 31 descends along the guide 34 to the lowest position, and the stopper 1 comes into close contact with the nozzle 21 at the bottom of the tundish, stopping the supply of molten metal.
本発明による改善を、基本発明のシステムと制
御性を比較することにより示せば、つぎのとおり
である。 The improvements made by the present invention can be illustrated by comparing controllability with the system of the basic invention as follows.
基本発明 本発明
湯面レベル変動幅（mm）
最良制御時 ± ５ ±３
耐火物溶損 ±12 ±７
発生時
湯面制御レベル ±7.5 ±4.4
（平均、mm）
このように、本発明に従えば、湯面レベルを実
質上不変に保つことができる。 Basic invention This invention Molten metal level fluctuation width (mm) Best control ± 5 ± 3 Refractory erosion ± 12 ± 7 Molten metal level control level at occurrence ± 7.5 ± 4.4 (Average, mm) In this way, according to the present invention For example, the hot water level can be kept virtually unchanged.
第１図は、本発明の連続鋳造モールド湯面の自
動制御装置の構成を示す系統図である。第２図お
よび第３図は、先行の基本発明における問題を説
明するためのものであつて、第２図はストツパー
開度調節機構の要部を示す図であり、第３図はス
トツパー先端の動きを示す部分詳細図である。第
４図および第５図は、本発明による改良を説明す
るためのものであつて、第４図は本発明のストツ
パー開度調節機構の要部を示す第２図に対応する
図であり、第５図は第４図の機構の作動の状況を
示す図である。
１……ストツパー、２……溶湯容器、３……ス
トツパー開度調節機構、３１……固定アーム、３
２……作動アーム、３３……サーボモーター、３
８……結合アーム、３９……拘束アーム、４……
モーター制御回路、５……モールド、６……湯面
検出装置。
FIG. 1 is a system diagram showing the configuration of an automatic control device for continuous casting mold molten metal level according to the present invention. Figures 2 and 3 are for explaining the problems in the previous basic invention, and Figure 2 shows the main parts of the stopper opening adjustment mechanism, and Figure 3 shows the tip of the stopper. FIG. 3 is a partial detailed view showing movement. 4 and 5 are for explaining the improvements according to the present invention, and FIG. 4 is a diagram corresponding to FIG. 2 showing the main parts of the stopper opening adjustment mechanism of the present invention, FIG. 5 is a diagram showing the operation of the mechanism shown in FIG. 4. 1... Stopper, 2... Molten metal container, 3... Stopper opening adjustment mechanism, 31... Fixed arm, 3
2... Operating arm, 33... Servo motor, 3
8...Connection arm, 39...Restriction arm, 4...
Motor control circuit, 5... mold, 6... hot water level detection device.
Claims (1)
可変ストツパーつき溶湯容器、モールド湯面検出
装置およびストツパー開度調節機構から本質的に
構成される連続鋳造モールド湯面の自動制御装置
であつて、ストツパー開度調節機構が、溶湯容器
に固定された固定アーム、この固定アーム上にテ
コの支点を有する作動アーム、この作動アームと
ストツパー上端をテコの動作点において結合する
結合アーム、固定アームに固定され作動がアーム
のテコの力点にとりつけられたネジつきサーボモ
ーター、および前記モールド湯面検出装置からの
信号に応じてサーボモーターを回転させて作動ア
ームの力点を上下動させるモーター制御回路から
なり、固定アームのテコ支点を下部固定支点とし
てその上方に上部固定支点を設け、テコの動作点
すなわち作動アームと結合アームとの結合点を下
部移動支点とし、その上方に上部移動支点を設
け、上部固定支点と上部移動支点とを拘束アーム
で拘束して、上記４支点間で平行四辺形を形成
し、力点の上下動をテコで縮小して動作点に伝
え、上記の四辺形状の連結によりストツパーが横
振れを実質上伴わずに上下に動きストツパー開度
の微細な調節を可能にしたことを特徴とする自動
制御装置。 ２ ４支点間で形成する四辺形がほぼ平行四辺形
状であるが、下部固定支点−移動支点間より上部
固定支点−移動支点間をわずかに短くした四辺形
である特許請求の範囲第１項の自動制御装置。[Scope of Claims] 1. Automatic control of continuous casting mold level essentially consisting of a molten metal container with a variable stopper for supplying molten metal to a mold for continuous casting, a mold level detection device, and a stopper opening adjustment mechanism. The stopper opening adjustment mechanism includes a fixed arm fixed to a molten metal container, an operating arm having a lever fulcrum on the fixed arm, and a connecting arm that connects the operating arm and the upper end of the stopper at the operating point of the lever. , a screwed servo motor fixed to the fixed arm and whose operation is attached to the lever force point of the arm, and a motor that rotates the servo motor in response to a signal from the mold level detection device to move the force point of the operating arm up and down. It consists of a control circuit, with the lever fulcrum of the fixed arm as the lower fixed fulcrum, an upper fixed fulcrum above it, the operating point of the lever, that is, the connection point between the operating arm and the coupling arm, as the lower movable fulcrum, and above that the upper movable fulcrum. The upper fixed fulcrum and the upper movable fulcrum are restrained by a restraint arm to form a parallelogram between the four fulcrums, and the vertical movement of the force point is reduced by a lever and transmitted to the operating point, thereby forming the above quadrilateral shape. An automatic control device characterized in that the stopper moves up and down with virtually no lateral vibration due to the connection of the two, thereby making it possible to finely adjust the stopper opening degree. 2. The quadrilateral formed between the four fulcrums is approximately a parallelogram, but the quadrilateral formed between the upper fixed fulcrum and the movable fulcrum is slightly shorter than the distance between the lower fixed fulcrum and the movable fulcrum, as set forth in claim 1. Automatic control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5119883A JPS59178161A (en) | 1983-03-26 | 1983-03-26 | Automatic control system for molten metal surface in continuous casting mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5119883A JPS59178161A (en) | 1983-03-26 | 1983-03-26 | Automatic control system for molten metal surface in continuous casting mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59178161A JPS59178161A (en) | 1984-10-09 |
| JPH0525586B2 true JPH0525586B2 (en) | 1993-04-13 |
Family
ID=12880187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5119883A Granted JPS59178161A (en) | 1983-03-26 | 1983-03-26 | Automatic control system for molten metal surface in continuous casting mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59178161A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102513515A (en) * | 2011-12-20 | 2012-06-27 | 秦皇岛首秦金属材料有限公司 | Method for automatically changing slag line of tundish submersed nozzle for ultra-thick plate blank casting machine |
| CN105081254B (en) * | 2015-09-07 | 2017-09-26 | 苏州有色金属研究院有限公司 | The fluid level control device of crystallizer used in magnesium alloy semi-continuous casting |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS529852U (en) * | 1975-07-09 | 1977-01-24 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57200357U (en) * | 1981-06-17 | 1982-12-20 |
-
1983
- 1983-03-26 JP JP5119883A patent/JPS59178161A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS529852U (en) * | 1975-07-09 | 1977-01-24 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59178161A (en) | 1984-10-09 |
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